Help with photo stitching please!!

IanLewis

IanLewis

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47
Name
Ian
Edit My Images
Yes
Ive taken this pano of 7 images of Lands End in Cornwall and stitched them together with photoshop cs5. What I want to know is how I can go about straightening the horizon so it is not curved! SOMEBODY PLEASE HELP!!!!!!!!!

Many thanks!!

6050589173_5e6d2226fc.jpg
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Lands End Pano by Photography by Ian Lewis, on Flickr[/IMG]
 
Filters - lens correction - straighten tool (a)

ignore, that wont work
 
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I'm not sure why you got that curvature, my guess is that you didn't have enough overlap in the foreground, just a guess. I've taken as many as 24 shots (up, down and across) and i didn't get curvature...
 
chetanls said:
You can try Edit > Transform > Warp on CS5.
Click to expand...

Digifrog said:
Pano's like this can be corrected using DxO Optics Pro.
Click to expand...

Not good ideas. The key is to get it right when you construct the panorama - by telling the stitching software how to do it properly - not afterwards.


Edsport said:
my guess is that you didn't have enough overlap in the foreground
Click to expand...

IanLewis said:
I think it had something to do with shooting at 17mm of my 17-40mm L F4 wide angle lens!!
Click to expand...

No, neither of these are the reason.


The basic issue here is that the centre of your finished image isn't on the horizon. The stitching software needs a "reference point" so that it knows how to calculate the appropriate yaw / pitch / roll parameters, and if you don't tell it otherwise then it assumes that the reference point is the centre of the image. This will give a curved horizon if the reference point isn't on the horizon, as is the case here.

I don't know CS5 so I don't know how much control you have over the parameters. The stitching software I use, PT Assembler, allows me to set the reference point explicity. Here is a section in the PT Assembler tutorial that describes the process and why it's so important.
 
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